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<br />Sewer Maintenance <br /> <br />Since wastewater flows do not vary significantly except due to infiltration/inflow, which must be <br />shared by all customers of the system, allocation and distribution of all costs for wastewater <br />collection may be made among customer classes on the basis of average annual wastewater flow <br />contribution to the system. All capital costs and operation and maintenance costs associated with <br />the wastewater collection system should be allocated on the basis of relatiyepef(;entages of <br />wastewater flow during the test period. <br />Wastewater Treatment <br />Factors affecting wastewater treatment are different and many. Not only the\volume of <br />wastewater contribution by a class of customer is relevant, blJtalso the quality of the wastewater <br />is important. Treatment facilities must be designed t01lle~t both the hydraulic loading>fmd the <br />biochemical loading. Historically, the City's wastewater utililYllas measured wastewater <br />strength in terms ofthree parameters: <br />a. BOD (Biological Oxygen Demand) <br />b. TSS (Total Suspended Sqlids) <br />c. Ammonia (NH3) <br /> <br />Costs of operating and maintaining the treatroent plant,<fherefore, must be allocated and <br />":',",'::.-,:",._', "',' <br /> <br />functionalized by these parameters,I30D, TSS a:I1q NH3, so that revenues may be collected from <br />the customer on the ba.!lis of not only quantity ofwiiStewater, but also quality of the wastewater. <br />Lift Station <br /> <br />Lift stationsJl.re1lS~d to elevate waste along the wastewater collection system or into to the <br />treatmeI1f plant. Since.> the costs.aSsociated with lift stations depend on the quantity of <br />wasteWa.ter and not the quaJ,ity of wastewater, lift station costs were functionalized to flow. <br /> <br />City of Paris, Texas <br />Water and Wastewater Cost of Service Study <br />June 2007 <br /> <br />17 <br /> <br />-r-....-,.-....-.-.... . <br />